I believe Ruger also offers the M77 in 6.5 creedmore. But given the choice between it and the .260 rem, I'd take the .260 every time. Trouble with that is fewer companies are chambering their rifles for .260 rem nowadays. My ranking of 6.5 cartridges is: (this is entirely opinion)

1. 260 rem
2. 6.5x55 swede
3. 264 win mag
4. 6.5 creedmore
5. 6.5x284
6. 264 Weatherby Mag (wildcat) a.k.a. 6.5-.257 wby.
So will the creedmore last? Probably, but I doubt it will ever be any bigger than it is right now